This is a simple model I mocked up for my Jedi Fallen Order V2 saber that was needing some sprucing up of the damaged crystal chamber pommel/handle. You may need to measure for your specific crystal and make adjustments. Here is the link to the amazon site for crystals that I used.

https://www.amazon.com/gp/product/B09VPMBDLY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1&fbclid=IwAR1rU_bIHYp-ratHs6CpLBqIyGxDU5zaKqhjwX8LBM1UNOKq1mrbAY_GjRg